Flanges are used to make connections between pipe, valves, and other parts. They include a place to insert pipe (the center ring) and bolt holes for hardware to attach the CPVC flange to another flanged connection. Schedule 80 CPVC flanges have different bolt hole patterns depending on the size of the flange.

Some flanges are designed just to close off the end of a pipe line. These are called blind flanges. Blind CPVC flanges have no center opening, just a solid piece of CPVC with bolt holes for attachment. The two other main flange types are solid one-piece and loose-ring 2-piece. Loose ring flanges (called Van Stone) allow for easier lining up of bolt holes after the pipe has been attached to the center ring. All three styles are available in CPVC schedule 80.